I am attempting to code a very simple program that would take temp readings from thermcouples attacthed to Feild Point Modules and using a min/max temp range, control inflow of steam to raise low temp instances. I have searched a lot of the examples and tutorials, but have yet to find anything specific to this. I am just getting started on writing this from scratch, and any guidance or help would be great! I am using LabVIEW 6.1 Development Package with LabVIEW 7.1 Express.

I am VERY new to this, but finding LabVIEW to be extremely functional. I am the one that is functionally challenged!

Thanks!
Jay

I've never worked with steam, but I expect it's straightforward. There are very good relay modules in Fieldpoint with NO and NC connections for 8 relays. You can probably wire these up to control the valves with 24V DC or 120VAC or whatever.

In the program keep checking the temperature and when it goes < setpoint turn on the steam valve. When it is > setpoint turn off the steam. The temperature difference between < and > is called “Dead Band” You can set this yourself to be >(Setpoint+0.5) or <= Setpoint. If you need to control the temperature very carefully then look into PID controller logic of devices. The simple On Off I'm suggesting is rather rough and ready. Get it so the temperature stays within the required settings and the relays are not turning on and off all the time.

Yours Sincerely
John